function ec(sport) {
    var parentSport = document.getElementById(sport);
    if(parentSport.childNodes[1].style.display == "") {
        var disp = "none";
    }
    else {
        var disp = "";
    }
    for(var i = 0; i < parentSport.childNodes.length; i++) {
        if(parentSport.childNodes[i].nodeType == "1") {
            parentSport.childNodes[i].style.display = disp;
        }
    }
}